"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XSTP-K1B : accessed 2 August 2021), Robert M Bingham in household of Harold S Bingham, Wheeling, Cook, Illinois, United States; citing enumeration district (ED) ED 2369, sheet 8A, line 28, family 147, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 505; FHL microfilm 2,340,240.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KW4X-BS7 : 8 January 2021), Robert Bingham in household of Harold Bingham, Wheeling Township, Cook, Illinois, United States; citing enumeration district (ED) 16-498, sheet 5B, line 73, family 94, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 789.
"Oklahoma, County Marriages, 1890-1995." Database with images. FamilySearch. "Oklahoma, County Marriages, 1890-1995," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VXLK-RW1 : 23 February 2021), Robert M Bingham and Eleanor Jane Barrons, 30 Aug 1941; citing Oklahoma, various county courthouses, Oklahoma; FHL microfilm.
Obituary, The Times (Shreveport, Louisiana), 14 Jul 1999, page 2B
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DNA Connections
It may be possible to confirm family relationships with Robert by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: